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Ultrafine Fe 3 O 4 Quantum Dots on Hybrid Carbon Nanosheets for Long‐Life, High‐Rate Alkali‐Metal Storage
Author(s) -
Liu Shaohong,
Wang Yuwei,
Dong Yanfeng,
Zhao Zongbin,
Wang Zhiyu,
Qiu Jieshan
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500410
Subject(s) - materials science , anode , electrolyte , alkali metal , nanotechnology , energy storage , quantum dot , carbon fibers , ionic bonding , nanocomposite , nanoparticle , fabrication , diffusion , electrode , ion , chemical engineering , chemistry , composite number , composite material , power (physics) , medicine , physics , alternative medicine , organic chemistry , quantum mechanics , pathology , engineering , thermodynamics
Abstract One promising and economic step towards technological advancements in Na‐ion and Li‐ion batteries is to develop versatile electrode materials for alkali‐metal storage. Transitional‐metal oxides are appealing candidates, owing to their intrinsically low cost, high capacity, and enhanced safety. However, they generally show poor activity and a short lifespan in practical use. Herein, we report the fabrication of a versatile long‐life, high‐rate anode material for Li/Na storage by strongly binding ultrafine Fe 3 O 4 quantum dots onto hybrid carbon nanosheets. Such nanocomposites are advantageous for inhibiting particle aggregation, reducing ionic diffusion pathways, and enabling fast accessibility to electrolyte ions across large electrode–electrolyte interfaces. They exhibit a long lifetime of 1000 cycles, high capacities, and exceptional high rate capabilities towards alkali‐metal storage, highlighting great promise in high‐energy and high‐power energy applications.